Sound For A Minute Then It Fades Out
When I first turn on my iPod I get a severe buzzing sound out of the headphones and the music is very difficult to make out. Then within a minute or two when the unit warms up, both the buzzing and the music slowly fades away until the unit makes no sound at all. The same thing happens when I connect the unit to a docking station.
Try connecting it to a dock that can play music from (iHome, Apple Universal Dock, Ect.) And see if the music is still messed up. If it isn't, then the headphone jack/hold switch assembly is probably bad.